Dear friend,
The M9 runs on deeply customized system. There are four 3rd-party apps preinstalled on the M9, and they are Tidal, MOOV, KKBOX and 网易云音乐(NetEaseCloud).
To ensure system stability, only certain apps in our white list are allowed to be installed. You can copy the apk file of the qualified app to the M9, then open the File Management app, locate and click on the apk file to install it.
The apps in the M9's white list are inlcuding
Spotify, Qobuz, Roon and Deezer, and the app download links for them are as follows:
Spotify:
click here
Qobuz:
click here
Roon:
click here
Deezer:
click here
Best regards